Polling has been updated at "El -- US Senate Race at a Glance". Republicans continue to solidify their lead as we approach election day.
The most probable outcome is for Republicans to win 51 seats. If Orman then caucuses with the controlling party, that will give the Republicans a grand total of 52 seats.
One thing that has changed is that the second most probable outcome is that the Republicans outright win 52 seats, and, again, if Orman caucuses with them, getting a grand total of 53 seats.
More graphs, as well as a state by state breakdown, can be found at the "El -- US Senate Race at a Glance" page.